Multilayer polyolefin film as a pvc replacement film

Details Multilayer polyolefin film as a pvc replacement film Multilayer polyolefin film as a pvc replacement film

B - Operations, Transporting

32

B

B32B 27/32 (2006.01)

Patent

CA 2422615

A coextruded multilayer film laminate featuring a polyolefin based formulation which closely matches the mechanical performance criteria of a plasticized PVC film is disclosed. This film is particularly suitable for use as a replacement film for plasticized PVC in a variety of medical and non-medical applications. The multilayer films of the present invention offer a particular set of mechanical properties, normally associated with plasticized PVC, including easy stretch, high degree of recovery, low fatigue and minimal permanent set. Moreover, these polyolefin based formulations do not contain any known or suspected carcinogenic compounds and may be produced at costs that are highly competitive with the costs associated with a conventional, plasticized PVC film. This film comprises a core layer of a metallocene ULDPE polyolefin plastomer/ethylene copolymer blend and at least one skin layer of a LLDPE/LDPE blend coextruded on either side of said core layer.

L'invention concerne un stratifié sous forme de film à couches multiples coextrudé caractérisant une formulation à base de polyoléfine qui correspond étroitement aux critères de performance mécanique d'un film de PVC plastifié. Ce film convient particulièrement comme film de remplacement de PVC plastifié dans une variété d'applications médicales et non médicales. Les films multicouches de l'invention offrent un ensemble particulier de propriétés mécaniques, généralement associées au PVC plastifié, comprenant un étirement facile, un degré élevé de reprise, une faible fatigue et une déformation résiduelle minimale. En outre, ces formulations à base de polyoléfine ne contiennent aucun composé quelconque supposé cancérigène et peuvent être produites à des coûts très compétitifs en comparaison de ceux associés à un PVC plastifié classique. Ce film comprend une couche centrale d'un mélange de plastomère polyoléfinique ULDPE métallocène et de copolymère d'éthylène, et au moins une couche de peau d'un mélange LLDPE/LDPE coextrudé de chaque côté de la couche principale.

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